The present invention relates to a radial foil bearing for supporting a rotary shaft. The radial foil bearing includes a top foil, a back foil, and a bearing housing accommodating the top and back foils. The top foil is formed by winding a rectangular metal foil into a cylindrical shape so that one end of the metal foil is extended out in a tangential direction of a cylinder formed by the metal foil. An engagement groove is formed on an inner circumferential surface of the bearing housing in an axial direction of the bearing housing, and the engagement groove is formed so that a depth direction thereof corresponds to one tangential direction of the cylinder of the top foil. The one end of the top foil engages with the engagement groove.